Part A
2920L500/16MR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 2496 Stückzahl
- Package
- 2920 (7351 Metric), Concave
- Series
- PTC-Rückstellsicherungen
Replacement verdict
Not a drop-in replacement
The 2920L075DR and 2920L500/16MR are both 2920-size PPTC resettable fuses, but they differ fundamentally in hold current, trip current, voltage rating, and time-to-trip characteristics. The 2920L075DR is a 750 mA hold / 1.5 A trip device rated at 60 V, while the 2920L500/16MR is a 5 A hold / 10 A trip device rated at 16 V. Because the current-carrying and voltage-isolation requirements are mutually exclusive, neither part can directly substitute for the other in a validated circuit without redesigning the protection scheme.
Different hold current
Different voltage rating
Different trip current
Different time-to-trip
Parts at a glance
Part B
2920L075DR
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 5129 Stückzahl
- Package
- 2920 (7351 Metric), Concave
- Series
- PTC-Rückstellsicherungen
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 2920L075DR | 2920L500/16MR | Why it matters |
|---|---|---|---|
| Hold Current (Ih) | 0.75 A | 5.0 A | Defines the maximum continuous current the device passes without tripping; a mismatch changes the load the circuit can support. |
| Trip Current (It) | 1.5 A | 10.0 A | Determines the current at which the device reliably switches to a high-resistance state, affecting overcurrent protection threshold. |
| Maximum Voltage Rating | 60 V | 16 V | Sets the highest voltage the device can safely withstand; substituting a lower-rated part risks breakdown. |
| Initial Resistance (Rmin) | 0.30 Ω | 0.010 Ω | Affects voltage drop and power loss in normal operation; large differences impact circuit efficiency and signal integrity. |
| Post-Trip Resistance (R1max) | 1.20 Ω | 0.040 Ω | Determines the residual resistance after a trip event, influencing leakage and recovery behavior in the protected circuit. |
| Maximum Time to Trip | 0.30 s | 2.0 s | Indicates how quickly the device responds to an overcurrent event; slower trip times may not protect sensitive components. |
| Maximum Operating Voltage (Vmax) | 60 V | 16 V | Confirms the safe continuous voltage envelope; using a part with lower Vmax in a higher-voltage rail is unsafe. |
| Package Size | 2920 (7351 metric) | 2920 (7351 metric) | Footprint compatibility ensures the replacement can be mounted on the same PCB pads without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental limits for reliable operation; both matching means thermal compatibility is maintained. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 2920L500/16MR | 2920L075DR |
|---|---|---|
| Series | POLY-FUSE®, 2920L | POLY-FUSE®, 2920L |
| Part Status | Active | Active |
| Type | Polymeric | Polymeric |
| Voltage - Max | 16V | 30V |
| Current - Max | 40 A | 40 A |
| Current - Hold(Ih)(Max) | 5 A | 750 mA |
| Current - Trip(It) | 10 A | 1.5 A |
| Timeto Trip | 5 s | 300 ms |
| Resistance - Initial(Ri)(Min) | 5 mOhms | 350 mOhms |
| Resistance - Post Trip(R1)(Max) | 25 mOhms | 1 Ohms |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Size / Dimension | 0.289 L x 0.202 W (7.35mm x 5.12mm) | 0.289 L x 0.202 W (7.35mm x 5.12mm) |
| Thickness(Max) | 0.063 (1.60mm) | 0.049 (1.25mm) |
Frequently asked questions
What are the key differences between the 2920L075DR and the 2920L500/16MR?
The 2920L075DR is a 2920-size resettable PTC fuse with a hold current of 0.75 A and a maximum voltage rating of 60 V, while the 2920L500/16MR is a 2920-size resettable PTC fuse with a hold current of 5.00 A and a maximum voltage rating of 16 V. The primary differences are the hold current and voltage ratings, which determine the overcurrent protection level and the maximum circuit voltage each device can safely interrupt.
Are the 2920L075DR and 2920L500/16MR interchangeable in a circuit?
No, they are not directly interchangeable. The 2920L075DR has a much lower hold current (0.75 A) and a higher voltage rating (60 V), while the 2920L500/16MR has a higher hold current (5.00 A) and a lower voltage rating (16 V). Substitution requires verifying that the hold current, trip current, voltage rating, and time-to-trip characteristics meet the target circuit requirements.
What is the hold current of each device?
The 2920L075DR has a hold current of 0.75 A at 20°C, and the 2920L500/16MR has a hold current of 5.00 A at 20°C. Hold current is the maximum current the device will pass without tripping under specified ambient conditions.
What is the maximum voltage rating of each device?
The 2920L075DR is rated for a maximum voltage of 60 V, while the 2920L500/16MR is rated for a maximum voltage of 16 V. The maximum voltage rating indicates the highest circuit voltage the device can safely interrupt when it trips.
Do both devices use the same 2920 package footprint?
Yes, both the 2920L075DR and the 2920L500/16MR are supplied in the 2920 (inch-based) surface-mount package, which is approximately 7.98 mm × 5.59 mm. However, always confirm the exact pad layout and height from the respective manufacturer datasheets before designing a common footprint.
What are the typical applications for each device?
The 2920L075DR is typically used in higher-voltage, lower-current circuits such as 48 V telecom or industrial control lines, while the 2920L500/16MR is used in lower-voltage, higher-current circuits such as 12 V or 16 V power rails, battery packs, and USB power delivery paths. Selection depends on the circuit's normal operating current and maximum voltage.
What is the trip current of each device?
The 2920L075DR has a trip current of 1.50 A at 20°C, and the 2920L500/16MR has a trip current of 10.0 A at 20°C. Trip current is the minimum current at which the device will switch to its high-resistance state under specified conditions.
What is the maximum interrupt current (Imax) for each device?
The 2920L075DR has a maximum interrupt current of 40 A, and the 2920L500/16MR has a maximum interrupt current of 100 A. This rating defines the highest fault current the device can safely break without damage.
What is the operating temperature range for these devices?
Both the 2920L075DR and the 2920L500/16MR are specified for an operating temperature range of -40°C to +85°C. Note that hold current and trip current derate with ambient temperature, so the datasheet derating curves must be consulted for operation outside 20°C.